We divide 438321 by 12
We're looking to find how many times 12 goes into 438321.

Step 1:
The number 12 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 12

Let's proceed to step 2:
When dividing 43 by 12, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 36 from 43 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 12

Let's proceed to step 3:
78 divided by 12 is 6 with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
Subtract 72 from 78 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 12

On to step 4:
When dividing 63 by 12, we get 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 365.0
Subtracting 60 from 63 leaves us with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 12

Moving on to step 5:
32 divided by 12 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 3652.0
If we subtract 24 from 32, we get 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 12

Moving on to step 6:
If we divide 81 by 12, we get 6 and a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 36526.0
If we take 72 away from 81, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
The number 12 fits into 90 7 times, leaving a remainder of 6.
The next digit of our result is 7. 
Result so far: 36526.7
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
The number 12 fits into 60 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 36526.75
Deduct 60 from 60 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
12 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 36526.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
When dividing 0 by 12, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 36526.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 36526.75 with a remainder of 0.0.